I see that this is the last day of the sale. Does this affect the price of Fabfilters at the Auria store? Will they go in price tomorrow?

Yes, Fabfilter's sale ended Aug 1. We added an extra day (Aug 2nd) as a buffer, but depending on your Apple timezone it may have already be the 3rd (currently lunchtime here in the States), so prices have started going back up around the globe.